wall-mounted condensing boiler instructions manual for users and fitters Centrale murale cu gaz, cu condensare manual de instrucţiuni destinat

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1 GB RO RU HU GR wall-mounted condensing boiler instructions manual for users and fitters Centrale murale cu gaz, cu condensare manual de instrucţiuni destinat utilizatorului şi instalatorului Hастенные газовые конденcaтные котлы Руководство по эксплуатации и монтажу Kondenzációs fali gázkazánok Felhasználói és szerelői kézikönyv ΕΠΙΤΟΙΧΙΟΙ ΛΕΒΗΤΕΣ ΣΥΜΠΥΚΝΩΣΗΣ ΕΓΧΕΙΡΙΔΙΟ ΧΡΗΣΗΣ ΓΙΑ ΤΟ ΧΡΗΣΤΗ ΚΑΙ ΤΟΝ ΕΓΚΑΤΑΣΤΑΤΗ

2 Dear Customer, We are sure your new boiler will comply with all your requirements. Purchasing one of our products satisfies your expectations: good functioning, simplicity and ease of use. Do not dispose of this booklet without reading it: you can find here some very useful information, which will help you to run your boiler correctly and efficiently. Do not leave any parts of the packaging (plastic bags, polystyrene, etc.) within children s reach as they are a potential source of danger. Our boilers bear the CE mark in compliance with the basic requirements as laid down in the following Directives: - Gas Directive 90/396/EEC - Performance Directive 92/42/EEC - Electromagnetic Compatibility Directive 2004/108/EEC - Low Voltage Directive 2006/95/EC contents istructions pertaining to the user 1. Instructions prior to installation 3 2. Instructions prior to commissioning 3 3. Commissioning of the boiler 3 4. Filling the boiler 6 5. Switching the boiler off 6 6. Prolonged standstill of the system. Frost protection 6 7. Gas change 6 8. Servicing instructions 6 istructions pertaining to the installer 9. General information Instructions prior to installation Boiler installation Boiler size Fittings present in the packaging Installation of flue and air ducts Connecting the mains supply Changing gas type Displaying electronic control card parameters on the boiler display ( INFO mode) Control and operation devices Positioning of the ignition and flame sensing electrode Check of combustion parameters Activating the flue-sweeper function Output / pump head performances How to disassemble the DHW heat exchanger Cleaning the cold water filter Annual mainenance Using the Siemens QAA73 temperature regulator to program boiler parameters Boiler schematic Illustrated wiring diagram Technical data 32 instructions pertaining to the user GB

3 1. instructions prior to installation This boiler is designed to heat water at a lower than boiling temperature at atmospheric pressure. The boiler must be connected to a central heating system and to a domestic hot water supply system in compliance with its performances and output power. Have the boiler installed by a Qualified Service Engineer and ensure the following operations are accomplished: a) accurate purging of the whole pipework in order to remove any deposits. b) careful checking that the boiler is fit for operation with the type of gas available. For more details see the notice on the packaging and the label on the appliance itself. c) careful checking that the flue terminal draft is appropriate; that the terminal is not obstructed and that no other appliance exhaust gases are expelled through the same flue duct, unless the flue is especially designed to collect the exhaust gas coming from more than one appliance, in conformity with the laws and regulations in force. d) careful checking that, in case the flue has been connected to pre-existing flue ducts, thorough cleaning has been carried out in that residual combustion products may come off during operation of the boiler and obstruct the flue duct. 2. instructions prior to commissioning Initial lighting of the boiler must be carried out by a licensed technician. Ensure the following operations are carried out: a) compliance of boiler parameters with (electricity, water, gas) supply systems settings. b) compliance of installation with the laws and regulations in force. c) appropriate connection to the power supply and grounding of the appliance. The names of authorized Service Centres are listed on the accompanying sheet. Failure to observe the above will render the guarantee null and void. Prior to commissioning remove the protective plastic coating from the unit. Do not use any tools or abrasive detergents as you may spoil the painted surfaces. 3. commissioning of the boiler To correctly light the burner proceed as follows: 1) provide power supply to the boiler; 2) open the gas cock; 3) follow the directions given below regarding the adjustments to be made at the boiler control panel. instructions pertaining to the user GB

4 0806_0101 / CG_1816 Legend: Figure 1 1 Summer-Winter-Reset selector 2 Central heating function indicator 3 Domestic hot water (DHW) function indicator 4 Flame indicator 5 Display 6 Central heating temperature control knob 7 Domestic hot water temperature control knob 8 Pressure gauge The central heating system is disabled when the selector (1) is turned to Summer position ( ). All boiler safety systems (the anti-freeze system and the pump and three way valve anti-blockage systems) and the domestic hot water system remain active. Important: When you first switch the boiler on, the burner may fail to light and the boiler may block until all the air is expelled from the gas supply pipe. If this happens, simply turn the selector (1) to ( ) for at least 1 second, then repeat the burner lighting process until pure gas reaches the burner and it lights. 3.1 adjusting room temperature The central heating system must be equipped with a thermostat to control room temperature. If no room temperature thermostat is installed when the boiler is first started up, room temperature can be controlled using the control knob (6) instead. Simply turn the control knob clockwise to increase room temperature or anti-clockwise to decrease it. The electronic flame modulation system adapts the gas flow to the burner to suit varying heat exchange requirements as the boiler achieves the set temperature. 3.2 adjusting domestic hot water temperature The boiler electronically modulates the burner flame according to the setting of the hot water temperature control knob (7) and the water flow. The system therefore guarantees that water temperature from the boiler remains constant even when only a small flow is being drawn off. To save energy, keep the domestic hot water temperature control knob turned to --comfort-- (figure 2). In the winter it will probably be necessary to increase the temperature of the hot water to suit conditions. 0301_1002 Figure 2 instructions pertaining to the user GB

5 3.3 error messages and resetting the boiler If a fault occurs, the display reads out an error message identifying it. 0402_2504 Figure 3 Note: If the error message contains more than 2 digits (e.g. E133), the display reads out the first two digits E1 followed, by the last two digits 33, as shown in figure Table of faults and error messages Error code E10 E20 E28 E50 E110 E119 E125 E130 E133 E151 E156 E160 E193 Description of fault Outdoor temperature sensor fault Central heating NTC sensor fault Flue NTC sensor fault Domestic hot water NTC sensor fault Safety thermostat or fume sensor tripped No signal from water pressure switch Safety operation due to flow water fault or air inside circuit NTC flue sensor has cut out for overheat Gas supply fault Boiler control card fault Power supply voltage too low Fan has not reached threshold speed Air inside circuit Corrective action Call an authorised service centre. Call an authorised service centre. Call an authorised service centre. Call an authorised service centre. Turn selector (1) (figure 1) to R for at least 1 second. If this fault persists, call an authorised service centre. Check that the pressure in the system is as specified. See the section on filling the system. If this fault persists, call an authorised service centre. Turn selector (1-figure 1) to R for at least 1 second. If this fault persists, call an authorised service centre. Turn selector (1) (figure 1) to R for at least 1 second. If this fault persists, call an authorised service centre. Turn selector (1) (figure 1) to R for at least 1 second. If this fault persists, call an authorised service centre. Call an authorised service centre.check the position of the ignition electrodes (section 18). Wait until the power supply voltage returns to the normal value (230V). The reset to normal operation is automatic. Call an authorised service centre. The displayed anomaly is temporary. The reset is automatic All the faults are displayed in order of importance; if several faults occur simultaneously, the first to be displayed is the one with highest priority. After the cause of the first fault has been removed, the second one will be displayed, and so on. If any given fault occurs frequently, contact the authorised Service Centre. instructions pertaining to the user GB

6 4. filling the system Important: Regularly check that the pressure gauge (8 - figure 1) reads out a pressure of bar when the central heating system is cold. Open the boiler drain cock to reduce pressure if it is too high. Open the boiler filling cock (figure 4) to increase pressure if it too low. Always open the filling cock very slowly to allow any air to bleed off. If the pressure in the system drops frequently, contact an authorised service centre to have the system checked. novadens novadens _ _0304 / CG_2042 Figure 4a Boiler filling cock Boiler drain cock Figure 4b Boiler filling cock The boiler is equipped with a water pressure switch that prevents the boiler from starting up if there is no water in the system. 5. switching the boiler off To switch the boiler off, simply turn the selector 1 to the 0 position. This switches off the electricity supply to the appliance. 6. prolonged standstill of the system. frost protection We recommend you avoid draining the whole system as water replacements engender purposeless and harmful limestone deposits inside the boiler and on the heating elements. In case the boiler is not operated during wintertime and is therefore exposed to danger of frost we suggest you add some specific-purpose anti-freeze to the water contained in the system (e.g.: propylene glycole coupled with corrosion and scaling inhibitors). The electronic management of boilers includes a frost protection function in the central heating system which operates the burner to reach a heating flow temperature of 30 C when the system heating flow temperature drops below 5 C. The frost protection function is enabled if: * electrical supply to the boiler is on; * the gas service cock is open; * the system pressure is as required; * the boiler is not blocked. 7. gas change These boilers produced for natural gas can be converted to work with LPG. Any gas change must be effected by a Qualified Service Engineer. 8. servicing instructions To maintain efficient and safe operation of your boiler have it checked by a Qualified Service Engineer at the end of every operating period. Careful servicing will ensure economical operation of the system. Do not clean the outer casing of the appliance with abrasive, aggressive and/or easily flammable cleaners (i.e.: gasoline, alcohol, and so on). Always isolate the electrical supply to the appliance before cleaning it (see section 5 Turning off the boiler). instructions pertaining to the user GB

7 9. general information The following remarks and instructions are addressed to Service Engineers to help them carry out a faultless installation. Instructions regarding lighting and operation of the boiler are contained in the Instructions pertaining to the user section. Note that installation, maintenance and operation of the domestic gas appliances must be performed exclusively by qualified personnel in compliance with current standards. Please note the following: * This boiler can be connected to any type of double- or single feeding pipe convector plates, radiators, thermoconvectors. Design the system sections as usual though taking into account the available output / pump head performances, as shown in chapter 22. * Do not leave any packaging components (plastic bags, polystyrene, etc.) within children s reach as they are a potential source of danger. * Initial lighting of the boiler must be effected by a Qualified Service Engineer. Failure to observe the above will render the guarantee null and void. 10. instructions prior to installation This boiler is designed to heat water at a lower than boiling temperature at atmospheric pressure. The boiler must be connected to a central heating system and, on models withis option, to a domestic hot water supply system in compliance with its performances and output power. Before connecting the boiler have the following operations effected: a) accurate purging of the whole pipework in order to remove any pipe-threading, soldering or solvent deposits which may be contained in the different sections of the central heating system. b) careful checking that the boiler is fit for operation with the type of gas available. For more details see the notice on the packaging and the label on the appliance itself. c) careful checking that the flue terminal draft is appropriate; that the terminal is not obstructed and that no other appliance exhaust gases are expelled through the same flue duct, unless the flue is especially designed to collect the exhaust gase coming from more than one appliance, in conformity with the laws and regulations in force. d) careful checking that, in case the flue has been connected to pre-existing flue ducts, thorough cleaning has been carried out in that residual combustion products may come off during operation of the boiler and obstruct the flue duct. To ensure correct operation of the appliance and avoid invalidating the guarantee, observe the following precautions 1. Hot water circuit: if the water hardness is greater than 20 F (1 F = 10 mg calcium carbonate per litre of water) install a polyphosphate or comparable treatment system responding to current regulations. 2. Heating circuit 2.1. new system Before proceeding with installation of the boiler, the system must be cleaned and flushed out thoroughly to eliminate residual thread-cutting swarf, solder and solvents if any, using suitable proprietary products existing system: Before proceeding with installation of the boiler, the system must be cleaned and flushed out to remove sludge and contaminants, using suitable proprietary products. To avoid damaging metal, plastic and rubber parts, use only neutral cleaners, i.e. non-acid and non-alkaline (e.g. SENTINEL X400 and X100), proceeding strictly in accordance with the maker s directions. Remember that the presence of foreign matter in the heating system can adversely affect the operation of the boiler (e.g. overheating and noisy operation of the heat exchanger) IMPORTANT: when connecting an instantaneous boiler (mixed) to a system with solar panels, the maximum temperature of the DHW at the boiler inlet must not be greater than: 60 C with a flow limiting device 80 C without a flow limiting device instructions pertaining to the installer GB

8 11. boiler installation Decide upon the boiler location, then tape the template on the wall. Connect the pipework to the gas and water inlets prearranged on the template lower bar. If you are either installing the boiler on a pre-existent system or substituting it, we suggest you also fit settling tanks on the system return pipework and under the boiler to collect the deposits and scaling which may remain and be circulated in the system after the purge. When the boiler is fixed on the template connect the flue and air ducts (fittings supplied by the manufacturer) according to the instructions given in the following sections. Connect the condensate outlet to the siphon supplied with the boiler. Connect the siphon to a drain, making sure there is a continuous slope. Horizontal sections must be avoided. novadens novadens BOILER WIDTH 450 BOILER CONNECTION POINTS 0505_ BOILER HEIGHT 780 MR: G3/4 heating flow US: G1/2 domestic hot water outlet GAS: G3/4 gas inlet to the boiler ES: G1/2 cold water inlet RR: G3/4 heating return SC: condensate drain Figure boiler size 0806_0102 / CG_ _0801 / CG_1399 MR: G3/4 heating flow US: G3/4 domestic hot water boiler delivery GAS: G3/4 gas inlet to the boiler ES: G1/2 cold water inlet RR: G3/4 heating return SC: condensate drain Figure 6 instructions pertaining to the installer GB

9 template gas cock (1) inlet water tap with filter (2) seals telescopic joints 8 mm wall plugs and hooks 13. fittings present in the packaging novadens novadens _0106 / CG_ _0107 / CG_2042 Figure 7a 1 2 Figure 7b INSTALLAtion of flue and air ducts We guarantee ease and flexibility of installation for a gas-fired forced draft boiler thanks to the fittings and fixtures supplied (described below). The boiler is especially designed for connection to an exhaust flue / air ducting, with either coaxial, vertical or horizontal terminal. By means of a splitting kit a two-pipe system may also be installed. In case exhaust and intake flues not supplied by westen have been installed, these must be certified for the type of use and must have a maximum pressure drop of 100 Pa. C 33 C _0200 Warnings for the following types of installation: C 13, C 33 The terminals for the split flue must be provided for within a square with 50 cm sides. Detailed instructions are given together with each accessory. C 53 The terminals for combustion air intake and for the expulsion of combustion products must not be provided for on opposite walls of the building. C 63 The maximum pressure drop of the ducts must not exceed 100 Pa. The ducts must be certified for the specific use and for a temperature of over 100 C. The chimney flue must be certified in accordance with the pren Regulation. C 43, C 83 The chimney or flue used must be suitable for the use. C 13 C 13 C 43 C 53 C 83 Figure 8 warning To guarantee more operating insurance it is necessary to assure the flue pipes to the wall using the apposite clamps. instructions pertaining to the installer GB

10 Flue duct terminal Max. length of flue duct Each 90 bend reduces the duct max. length by Each 45 bend reduces the duct max. length by Flue terminal diameter Outer terminal diameter Coaxial Ø 60/100 mm Coaxial Ø 80/125 mm Vertical two-pipe Horizontal two-pipe 10 m 25 m 15 m 80 m 1 m 1 m 0,5 m 0,5 m 0,5 m 0,5 m 0,25 m 0,25 m 100 mm 133 mm 133 mm mm 125 mm 80 mm 80 mm coaxial flue - air duct (concentric) This type of duct allows to disengage exhaust gases and to draw combustion air both outside the building and in case a LAS flue is fitted. The 90 coaxial bend allows to connect the boiler to a flue-air duct in any direction as it can rotate by 360. It can moreover be used as a supplementary bend and be coupled with a coaxial duct or a 45 bend. If the flue outlet is placed outside, the flue-air ducting must protrude at least 18mm out of the wall to allow alluminium weathering tile to be fitted and sealed to avoid water leakages. Ensure a minimum downward slope of 1 cm towards the boiler per each metre of duct length _0400 A 90 bend reduces the total duct length by 1 metre. A 45 bend reduces the total duct length by 0.5 metre. Figure 9 Concentric outlet 14.1 horizontal flue terminal Ø 60/100 mm installation options L max = 10 m Ø 60/100 L max = 25 m Ø 80/ las flue duct Ø 60/100 mm installation options L max = 9 m Ø 60/100 L max = 24 m Ø 80/125 L max = 10 m Ø 60/100 L max = 25 m Ø 80/125 instructions pertaining to the installer GB

11 14.3 vertical flue terminal Ø 60/100 mm installation options This type of installation can be carried out both on a flat or pitched roof by fitting a terminal, an appropriate weathering tile and sleeve, (supplementary fittings supplied on demand) L max = 10 m Ø 60/100 L max = 25 m Ø 80/125 L max = 8 m Ø 60/100 L max = 23 m Ø 80/125 L max = 9 m Ø 60/100 L max = 24 m Ø 80/125 separated flue-air ducting This type of ducting allows to disengage exhaust flue gases both outside the building and into single flue ducts. Comburant air may be drawn in at a different site from where the flue terminal is located. The splitting kit consists of a flue duct adaptor (100/80) and of an air duct adaptor. For the air duct adaptor fit the screws and seals previously removed from the cap. flue duct adaptor _0100 Intake air duct adaptor Figure 10 The 90 bend allows to connect the boiler to flue-air ducting regardless of direction as it can be rotated by 360. It can moreover be used as a supplementary bend to be coupled with the duct or with a 45 bend. instructions pertaining to the installer GB

12 0806_0103 / CG_1818 Figure 11 A 90 bend reduces the total duct length by 0.5 metre. A 45 bend reduces the total duct length by 0.25 metre separated horizontal flue terminals installation options Important: Ensure a minimum downward slope of 1 cm toward the boiler per each metre of duct length. Make sure that the exhaust and intake ducts are securely fixed to the walls _ _0907 (L1 + L2) max = 80 m L max = 15 m The maximum length of the suction duct must be 15 metres. instructions pertaining to the installer GB

13 14.5 separated vertical flue terminals installation options _0700 L max = 15 m L max = 14 m Important: if fitting a single exhaust flue duct, ensure it is adequately insulated (e.g.: with glass wool) wherever the duct passes through building walls. For detailed instructions concerning the installation of fittings refer to the technical data accompanying the fittings. 15. connecting the mains supply Electrical safety of the appliance is only guaranteed by correct grounding, in compliance with the applicable laws and regulations. Connect the boiler to a 230V monophase + ground power supply by means of the three-pin cable supplied with it and make sure you connect polarities correctly. Use a double-pole switch with a contact separation of at least 3mm in both poles. In case you replace the power supply cable fit a HAR H05 VV-F 3x0.75mm 2 cable with an 8mm diameter max. The fuse, a fast-acting type rated 2A, are incorporated into the power supply terminals (remove the black fuse holder to enable inspection and/or replacement). 0409_0201 L N 1 2 Terminals M1 Terminals M2 Cover Cover Figure _0207 instructions pertaining to the installer GB

14 15.1 Description of the electrical connections to the boiler Turn the control box downward to access terminal boards M1 and M2 used for the electrical connections by removing the two protective covers (see figure 12). Terminals 1-2, terminal board M1: room temperature thermostat TA. Terminals 4-5, terminal board M2: connections for the optional SIEMENS QAA73 temperature regulator. These connections do not have any specific polarity. Remove the bridge between terminals 1-2 TA on terminal board M1. Read the instructions provided with the temperature regulator to ensure correct installation and programming. Terminals 7-8: connections for the optional SIEMENS QAC34 outdoor temperature sensor. Read the instructions provided with the outdoor temperature sensor to ensure correct installation. Terminals 9-10: connections for the optional domestic hot water priority sensor, for connecting single system boilers to external DHW boilers. warning If the heating is directly connected to a floor heating system, a safety overheating thermostat should be provided by the installer connecting the qaa73 temperature regulator An optional interface card is required to connect the QAA73 temperature regulator to boiler s own electronic control card. Connect the interface card to connector X 300 on the boiler s electronic control card (figure 13). Terminals 1-2-3, terminal board M2: connections for a zone control solenoid valve (see figure 15 in section 15.4). 0403_2502 Screw Cable guide LEGEND: N.C. C N.O. - Normally Closed contacts - Common - Normally Open contacts Figure 13 WIRE COLOURS: M Brown N Black C Light blue R Red Domestic hot water temperature and timing must be programmed on the QAA73 temperature regulator. The timed program of the central heating circuit must be set on the QAA73 if there is a single zone, or in relation to the zone controlled by the QAA73 device. See the instructions provided with the QAA73 temperature regulator for the user parameter programming procedure. instructions pertaining to the installer GB

15 QAA73: parameters which can be set by the installer (service) By pressing the two PROG buttons together for at least three seconds it is possible to access the list of parameters that the installer can display and/or set. Press either of these buttons to change the parameter to display or change. Press the [+] or [-] key to change the value displayed. Press either of the PROG buttons again to save the change. Press the information button (i) to quit programming. Here follows a list of the most commonly used parameters: Line no. Parameter Range Default value 70 HC1 gradient Selection of central heating circuit temperature curve kt HC1 max. output Central heating system maximum output temperature Type of building Light, Heavy Light 75 Room compensation Activation/deactivation of the influence of the room temperature. If it is deactivated, the outdoor temperature sensor must be installed. on HC1 on HC2 on HC1+HC2 nil On HC1 77 Automatic adaptation of the temperature curve kt in relation to the room temperature. On - off On 78 Opt Start Max Maximum time the boiler is switched on ahead of the timed program to optimise the temperature in the premises min 0 79 Opt Stop Max Maximum time the boiler is switched off ahead of the timed program to optimise the temperature in the premises min 0 90 DHW Red Setp Minimum temperature of the domestic domestic hot water 10 or DHW program Selection of the type of timed program for domestic hot water. 24 h/day = always on PROG HC-1h = as HC1 central heating program less one hour PROG HC = as central heating program PROG ACS = specific domestic hot water program (see also program lines 30-36) 24 h/day TSP HC-1h TSP HC TSP DHW 24 h/day - fault messages In the event of fault, the display panel on the QAA73 shows the flashing symbol the error code and a description of the fault (see errors table in section 3.3.1).. Press the information key ( ) to display instructions pertaining to the installer GB

16 15.3 connecting the outdoor temperature sensor probe The SIEMENS model QAC34 outdoor temperature sensor probe (optional accessory) must be connected to terminals 5-6 of terminal board M2 in figure 12. The procedures for setting the gradient of the temperature curve kt vary depending on the accessories connected to the boiler. a) Without the QAA73 temperature regulator When an outdoor temperature sensor is connected, the central heating temperature control knob (fig. 14) shifts the heating curves (graph 2). Turn the knob clockwise to increase room temperature, anti-clockwise to decrease it. Figure 14 shows the correct position of the knob for operation without shifting the curves. 0806_0802 / CG_1819 Figure 14 Modify parameter 532 on the QAA73 temperature regulator to select the desired temperature curve Kt, as instructed in chapter 26. Graph 1 shows the available temperature curves. Graph _ _1601 Graph 2 TM = Flow temperature Te = Composite outside temperature instructions pertaining to the installer GB

17 b) with QAA73 temperature regulator: The temperature curve kt must be selected by setting parameter 70 HC1 gradient of the QAA73 temperature control device as described in section 15.2 QAA73: parameters which can be set by the installation engineer (service). See graph 3 for selecting the curve referred to a room temperature of 20 C. The curve is shifted automatically on the basis of the room temperature set using the QAA73 climate control. If the central heating system is divided into more than one zone, the temperature curve must be set on the QAA73 and in the boiler (See section 26 for boiler settings.). The appliance s electronic control system provides a central heating output temperature equal to the highest of the two values set on the QAA73 and in the boiler. 0403_2504 Graph 3 TM = Flow temperature Te = Composite outside temperature 15.4 electrical connections to a multi-zone system The electrical connections and settings needed to control a multi-zone central heating system vary depending on what accessories are connected to the boiler. To permit the boiler to handle requests from individual zones, turn the Summer/Winter selector (1 - figure 1) on the boiler s front panel to Winter ( ) position. a) Without a QAA73 temperature regulator: Connect the switch for functioning in multi-zone mode in parallel to the TA terminals 1-2 on terminal board M1 as shown in figure 12. Remove the default bridge. Set the desired temperature with knob 6, figure 1, directly on the boiler control panel. b) With the QAA73 temperature regulator: Connect the switch controlling those zones not controlled by the QAA73 in parallel to the TA terminals 1-2 of terminal board M1 as shown in figure 15. Remove the default bridge. The zone controlled by the QAA73 is supplied by the zone 1 solenoid valve as shown in figure 15. The QAA73 automatically controls room temperature in its own zone. instructions pertaining to the installer GB

18 Use the boiler control panel to set room temperature in the other zones. 1 Zone (QAA 73) 1 Zone (ROOM THERMOSTAT) 2 Zone (ROOM THERMOSTAT) 3 Zone (ROOM THERMOSTAT) N Zone (ROOM THERMOSTAT) 0402_25010 solenoid valve 1 Zone Figure 15 Case 1: installation without an outdoor temperature sensor: Use the central heating temperature control knob (6 - figure 1) on the boiler s control panel to set central heating output temperature to the various zones. If heating requests are received simultaneously from the main zone controlled by the QAA73 and another zone, output temperature will be the higher of the two values set on the QAA73 and on the boiler s central heating temperature control knob. Case 2: installation with an outdoor sensor: Central heating output temperature to the various zones is determined by the electronic control card on the basis of outdoor temperature and the preset heating curve as described in section If heating requests are received simultaneously from the main zone controlled by the QAA73 and another zone, output temperature will be the higher of the values set on the QAA73 and calculated by the boiler s electronic control card Connecting an external boiler (novadens 1.240) Boiler models novadens feature a three way power valve for connecting an external boiler. Connect the boiler water pipes as shown in figure 16. Remove the resistor from terminals 9-10 of terminal board M2, and connect the optional DHW priority sensor to them (figure 16). Insert the sensor s probe in the relevant hole in the boiler. Set domestic hot water temperature using the control knob 7, figure 1 on the boiler s front panel. instructions pertaining to the installer GB

19 LEGEND UB: DHW boiler unit UR: central heating unit V3V: three way valve M2: terminal board SB: DHW priority sensor MR: central heating delivery MB: DHW delivery RR: central heating/dhw return RB: resistor, to be removed Figure _2511 NOTE: legionella function is active (factory set = ON; see section 26 parameter 555.1). 16. gas change type Proceed as follows to calibrate the gas valve. 1) Calibrate maximum thermal power. With the boiler operating at maximum thermal power, check that the value for CO 2 measured in the flue corresponds to that specified in table 1. If necessary, turn the adjuster screw (V) on the gas valve. Turn clockwise to reduce the CO 2 level or anti-clockwise to increase it. 2) Calibrate minimum thermal power. With the boiler operating at minimum thermal power, check that the value for CO 2 measured in the flue corresponds to that specified in table 1. If necessary, turn the adjuster screw (K) on the gas valve. Turn clockwise to increase the CO 2 level or anti-clockwise to reduce it. 0310_0114 Pi: Gas supply pressure measurement point P out: Gas feed to burner pressure measurement point P: Offset pressure measurement point Pl: Air signal input from fan V: Gas flow adjustment screw K: Offset adjustment screw Figure 17 instructions pertaining to the installer GB

20 16.1 activating the calibration function Proceed as follows to enter calibration function on the boiler control panel and calibrate the gas valve. 1) Turn the control knobs 6 and 7 (figure 1) fully anti-clockwise to their minimum positions as shown in figure 18A. 2) Starting in this position, quickly turn control knob 7 twice consecutively clockwise through about a 1 / 4 turn as shown in figure 18B. Note: LEDs 2 and 3 (figure 1) flash alternately and the display alternates the message SF and the boiler output temperature about every five seconds (figure 19). 3) Now turn knob 6 to adjust fan speed to a setting between minimum thermal power (0%) and maximum thermal power (100%). Note: In calibration function, the display alternates between the message P and the boiler output temperature about every 5 seconds (figure 20). 4) Calibration function remains active for 20 minutes. To exit calibration function before this time simply turn control knob 7 (figure 1). Note: This function is interrupted if the central heating delivery temperature reaches its MAX. SETPOINT. 0806_0104 / CG_1820 Figure 18A Figure 18B 0402_2513 ~ 5 seconds Figure 19 instructions pertaining to the installer GB

Do not leave any parts of the packaging (plastic bags, polystyrene, etc.) within children s reach as they are a potential source of danger.

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